<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <!--
      multiple: 允许多选
      size: 显示多少个选项
      selected: 默认选中
      value: 提交到服务器的值
  -->
  <select name="fruits" id="" multiple size="2">
    <option value="apple" selected>苹果</option>
    <option value="banana">香蕉</option>
    <option value="orange">橘子</option>
  </select>

</body>
</html>